m68k/mm: Check for mm != NULL in do_page_fault() debug code
When DEBUG is enabled, do_page_fault() may dereference a NULL pointer, causing recursive bus errors. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
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@ -77,8 +77,7 @@ int do_page_fault(struct pt_regs *regs, unsigned long address,
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#ifdef DEBUG
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printk ("do page fault:\nregs->sr=%#x, regs->pc=%#lx, address=%#lx, %ld, %p\n",
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regs->sr, regs->pc, address, error_code,
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current->mm->pgd);
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regs->sr, regs->pc, address, error_code, mm ? mm->pgd : NULL);
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#endif
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/*
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